debtree - a useful tool for Debian and derivatives

Has anybody tried debtree (available in Ubuntu from universe)? It's an interesting tool which visualizes package dependencies thus providing valuable insights. It's usage is shown on this site. You should also read its man page.

Using it is relatively simple:

debtree aptitude > aptitude.dot

creates a .dot file which can be transformed into a, e.g., png file with

dot -Tpng aptitude.dot -o aptitude.png

or, in one step, simply by executing:

debtree aptitude | dot -Tpng > aptitude.png

The result looks like this.

According to the man page the color of the arrows indicate the following:

Build-Depends: dark gold, bold
Build-Depends-Indep: light gold
Pre-Depends: purple, bold
Depends: blue
Recommends: black
Suggests: black, dotted
Conflicts: red
Provides: green, inverted arrow

However, there a traps. Depending on the package the created png file can grow extremely large. For example, I executed

debtree --no-versions --no-alternatives songbird

where the options already restrict the size of the output - but the png file was still 67 MB large! So it might be useful to use the options described in the man page like --max-depth=x if you're running into problems.